In a Seismic Event,two Types of Waves Are Created,a P-Wave

Multiple Choice

In a seismic event,two types of waves are created,a P-wave (longitudinal) and an S-wave (transverse) .The waves travel at speeds of 8 km/s and 5 km/s respectively.At a monitoring station,a P-wave is observed 10 s before the S-wave.How far is the seismic activity from the station? Assume that the waves travel in a straight line.

A) 50 km
B) 80 km
C) 30 km
D) 133 km
E) none of the above